The area of a circle can be calculated using one of the following 3 formulas: one if you know the radius, another if you know the diameter and finally another, if you know the perimeter of a circle.
If you know the radius of the circle (the line from the center to the edge), you can calculate its area using the following formula:
$$pi = "3.141592653589"$$
$$R = "circle radius"$$
If you know the diameter of the circle (the line that crosses the circle edge to edge through the center), you can calculate its area using the following formula:
$$"area" = (pi/4) * D^2$$
$$pi = "3.141592653589"$$
$$D = "circle diameter"$$
If you know the perimeter of a circle (circunference), you can calculate its area using the following formula:
$$"area" = P^2 / (4 pi)$$
$$pi = "3.141592653589"$$
$$P = "circle perimeter"$$
A circle is a shape or figure that is plane (2 dimensions) and perfectly round, with all points in the edge equidistant from the center.
The circle is a very basic geometric shape and a very common appearance in nature.
The circumference is the perimeter of a continuously curved shape, including a circle. It is the line around the curved shape that marks its boundary.
See perimeter.
It is the space of the internal surface in a figure, it is limited for the perimeter. Also, the area can be calculated in a plane of two dimensions.
It is a representation of a rule or a general principle using letters. (Algebra, A. Baldor)
When describing formulas in plural, it is also valid to say "formulae".
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